Bonneville Dam
Sunday August 31, 2025
| Hour | Total Outflow kcfs | Generation Flow kcfs | Spill kcfs | PH 1 Forebay Elevation | Tailwater Elevation | Average Head | Project Forebay Elevation | Stevenson Gage Elevation | Project Tailwater Elevation |
|---|
| 1 | 122.90 | 60.80 | 49.70 | 75.70 | 11.40 | 64.30 | 75.50 | 76.20 | 11.10 |
| 2 | 110.10 | 48.10 | 49.60 | 75.70 | 10.50 | 65.20 | 75.60 | 76.10 | 10.40 |
| 3 | 108.20 | 46.20 | 49.60 | 75.70 | 10.50 | 65.20 | 75.60 | 76.10 | 10.40 |
| 4 | 108.30 | 46.30 | 49.60 | 75.70 | 10.40 | 65.30 | 75.60 | 76.10 | 10.40 |
| 5 | 108.20 | 46.20 | 49.60 | 75.60 | 10.40 | 65.20 | 75.40 | 76.00 | 10.20 |
| 6 | 108.10 | 46.20 | 49.50 | 75.70 | 10.20 | 65.50 | 75.50 | 75.90 | 10.20 |
| 7 | 109.50 | 47.60 | 49.50 | 75.60 | 10.30 | 65.30 | 75.40 | 75.90 | 10.20 |
| 8 | 109.30 | 47.40 | 49.50 | 75.50 | 10.20 | 65.30 | 75.40 | 75.90 | 10.00 |
| 9 | 109.50 | 47.60 | 49.50 | 75.40 | 10.30 | 65.10 | 75.20 | 75.80 | 10.00 |
| 10 | 109.50 | 47.70 | 49.40 | 75.30 | 10.00 | 65.30 | 75.20 | 75.70 | 9.90 |
| 11 | 109.10 | 47.40 | 49.30 | 75.30 | 10.00 | 65.30 | 75.10 | 75.70 | 9.80 |
| 12 | 109.10 | 47.40 | 49.30 | 75.20 | 9.90 | 65.30 | 75.10 | 75.70 | 9.80 |
| 13 | 109.10 | 47.40 | 49.30 | 75.20 | 9.90 | 65.30 | 75.00 | 75.60 | 9.80 |
| 14 | 109.00 | 47.40 | 49.20 | 75.00 | 9.80 | 65.20 | 74.90 | 75.50 | 9.70 |
| 15 | 109.00 | 47.40 | 49.20 | 75.00 | 9.90 | 65.10 | 74.90 | 75.50 | 9.70 |
| 16 | 108.80 | 47.20 | 49.20 | 75.00 | 9.90 | 65.10 | 74.90 | 75.50 | 9.70 |
| 17 | 109.50 | 47.90 | 49.20 | 74.90 | 9.90 | 65.00 | 74.90 | 75.40 | 9.80 |
| 18 | 109.30 | 47.70 | 49.20 | 75.00 | 9.80 | 65.20 | 74.90 | 75.50 | 9.70 |
| 19 | 121.90 | 60.30 | 49.20 | 74.90 | 10.50 | 64.40 | 74.80 | 75.50 | 10.20 |
| 20 | 124.00 | 62.40 | 49.20 | 75.10 | 10.60 | 64.50 | 75.00 | 75.60 | 10.50 |
| 21 | 124.10 | 62.30 | 49.40 | 75.20 | 10.70 | 64.50 | 75.10 | 75.70 | 10.50 |
| 22 | 124.00 | 62.20 | 49.40 | 75.40 | 10.60 | 64.80 | 75.30 | 75.80 | 10.50 |
| 23 | 110.80 | 48.90 | 49.50 | 75.30 | 10.00 | 65.30 | 75.20 | 75.80 | 9.90 |
| 24 | 109.40 | 47.60 | 49.40 | 75.20 | 10.00 | 65.20 | 75.10 | 75.70 | 9.90 |
|
| AVG | 112.11 | 50.32 | 49.40 | 75.32 | 10.24 | 65.08 | 75.19 | 75.76 | 10.10 |
|
| MAX | 124.10 | 62.40 | 49.70 | 75.70 | 11.40 | 65.50 | 75.60 | 76.20 | 11.10 |
| MIN | 108.10 | 46.20 | 49.20 | 74.90 | 9.80 | 64.30 | 74.80 | 75.40 | 9.70 |
| |
Powerhouse 1 |
Powerhouse 2 |
Project |
| Hour | Generation Flow kcfs | Forebay Elevation | Forebay Elevation | Generation Flow kcfs | Spillway Gates in Use | Miscellaneous Flow kcfs* |
|---|
| 1 | 0.00 | 75.7 | 75.5 | 60.80 | 11 | 12.4 |
| 2 | 0.00 | 75.7 | 75.6 | 48.10 | 11 | 12.4 |
| 3 | 0.00 | 75.7 | 75.6 | 46.20 | 11 | 12.4 |
| 4 | 0.00 | 75.7 | 75.6 | 46.30 | 11 | 12.4 |
| 5 | 0.00 | 75.6 | 75.4 | 46.20 | 11 | 12.4 |
| 6 | 0.00 | 75.7 | 75.5 | 46.20 | 11 | 12.4 |
| 7 | 0.00 | 75.6 | 75.4 | 47.60 | 11 | 12.4 |
| 8 | 0.00 | 75.5 | 75.4 | 47.40 | 11 | 12.4 |
| 9 | 0.00 | 75.4 | 75.2 | 47.60 | 11 | 12.4 |
| 10 | 0.00 | 75.3 | 75.2 | 47.70 | 11 | 12.4 |
| 11 | 0.00 | 75.3 | 75.1 | 47.40 | 11 | 12.4 |
| 12 | 0.00 | 75.2 | 75.1 | 47.40 | 11 | 12.4 |
| 13 | 0.00 | 75.2 | 75.0 | 47.40 | 11 | 12.4 |
| 14 | 0.00 | 75.0 | 74.9 | 47.40 | 11 | 12.4 |
| 15 | 0.00 | 75.0 | 74.9 | 47.40 | 11 | 12.4 |
| 16 | 0.00 | 75.0 | 74.9 | 47.20 | 11 | 12.4 |
| 17 | 0.00 | 74.9 | 74.9 | 47.90 | 11 | 12.4 |
| 18 | 0.00 | 75.0 | 74.9 | 47.70 | 11 | 12.4 |
| 19 | 0.00 | 74.9 | 74.8 | 60.30 | 11 | 12.4 |
| 20 | 0.00 | 75.1 | 75.0 | 62.40 | 11 | 12.4 |
| 21 | 0.00 | 75.2 | 75.1 | 62.30 | 11 | 12.4 |
| 22 | 0.00 | 75.4 | 75.3 | 62.20 | 11 | 12.4 |
| 23 | 0.00 | 75.3 | 75.2 | 48.90 | 11 | 12.4 |
| 24 | 0.00 | 75.2 | 75.1 | 47.60 | 11 | 12.4 |
|
| AVG | 0.00 | 75.3 | 75.2 | 50.32 | 11 | 12.4 |
|
| MAX | 0.00 | 75.7 | 75.6 | 62.40 | 11 | 12.4 |
| MIN | 0.00 | 74.9 | 74.8 | 46.20 | 11 | 12.4 |
* Miscellaneous Flow includes fish ladders, PH1 sluiceway, navigation lock,
PH2 DSM, UMT, and PH2 corner collector (B2CC). When all routes are in
operation (March-August), total Misc Flow will be ~12.4 kcfs. Flow through
the B2CC is ~5 kcfs, so fluctuations of +/-5 kcfs at any time of year
indicate the B2CC is open/closed.